Question Details

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

Options

A

Only red flowered plants

B

Red flowered as well as pink flowered plants

C

Only pink flowered plants

D

Red, Pink as well as white flowered plants

Show Answer

Correct Answer :

Option B

Red flowered as well as pink flowered plants

Red flowered as well as pink flowered plants

Solution :

The correct option is: Red flowered as well as pink flowered plants

Step-by-Step Explanation:
1. Understanding the Inheritance Pattern:
Flower color in Snapdragon (Antirrhinum majus) is a classic example of incomplete dominance. In this inheritance pattern, the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes.
Let us define the alleles for flower color:
- Red flower allele: R1 (or simply R)
- White flower allele: R2 (or simply W)

2. Genotypes and Phenotypes:
- Homozygous red flowered plant: RR
- Homozygous white flowered plant: WW
- Heterozygous pink flowered plant: RW

3. Analyzing the Cross:
The question describes a cross between a pink flowered Snapdragon and a red flowered Snapdragon:
- Pink flower parent genotype: RW (produces R and W gametes)
- Red flower parent genotype: RR (produces only R gametes)

4. Determining the Progeny (F1 Generation):
We can use a Punnett square to determine the expected genotypes and phenotypes of the offspring:
- Crossing gamete R (from the red parent) with gamete R (from the pink parent) gives: RR (Red flower)
- Crossing gamete R (from the red parent) with gamete W (from the pink parent) gives: RW (Pink flower)

5. Conclusion:
The expected progeny will consist of 50% red flowered plants (RR) and 50% pink flowered plants (RW). Therefore, we expect to see red flowered as well as pink flowered plants in the progeny.

Unlock Our Free Library

Access expert-curated educational resources and study materials—completely free.

Ask AI Tutor
5 left
Q1 View Question & Options
AI Tutor is solving this question...
Reading question context & options...